Additional file 2.

Non-pathogenic variants in the KCNQ1, KCNH2, SCN5A, KCNE1, and KCNE2 genes. Variants within RYR2 are not reported due to small sample size. All missense substitutions, rare silent
substitutions (MAF less than 5%) and variants within −5 or +5 from the exon boundary
are reported. Common silent substitutions (MAF more than 5%) and intronic variants
more than 5 bp from an exon/intron boundary are not reported. NA = frequency of data
not available.